2.50 The nameplate on a 7.97-kV:266-V, 25-kVA single-phase transformer indicates that it has a series reactance of 7.5 percent (0.075 per unit). Calculate the series reactance in ohms as referred to (i) the low-voltage terminal and (ii) the high-voltage terminal. If three of these transformers are connected in a three-phase Y-Y connection, calculate (i) the three-phase voltage and power rating; (ii) the per unit impedance of the transformer bank; (iii) the series reactance in ohms as referred to the high voltage terminal and (iv) the series reactance in ohms as referred to the low-voltage terminal. Repeat part (b) if the three transformers are connected in Y on their HV.